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Share Repurchase Program (Tables)
12 Months Ended
Dec. 31, 2017
Share Repurchase Program [Abstract]  
Schedule of share repurchase program
The following table provides information about the Company's repurchase of shares of the Company's common stock for fiscal years 2015, 2016, and 2017:
Period (1)
 
Total Number of Shares Purchased
 
Average Price Paid per Share
 
Total Dollar Value Spent on Repurchases (in thousands)
2015 Repurchases (2)
 
4,907,675

 
$
43.99

 
$
215,911

2016 Repurchases
 
2,524,752

 
$
44.55

 
$
112,488

2017 Repurchases
 
2,325,825

 
$
47.29

 
$
110,000


(1)
All shares were purchased pursuant to the publicly announced share repurchase program described above. Shares are reported in a period based on the settlement date of the applicable repurchase. All repurchased shares of common stock have been retired.

(2)
The Company entered into an accelerated share repurchase ("ASR") in the second quarter of 2015 under which a prepayment of $75.0 million was made. Final settlement of the ASR occurred on August 3, 2015, resulting in the delivery to the Company of 0.8 million shares of the Company’s common stock and a return of cash for the remaining amount not settled in shares of $38.2 million. In total, approximately 0.8 million shares of common stock were repurchased under the ASR for $36.8 million, resulting in an average price paid per share of $46.49 under the ASR.